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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ 12,090,930 $ 52,730,870 $ (94,356,398) $ 139,402,758
Change in unrealized gain (loss) on open futures contracts (23,925,480) (71,923,920) (56,069,637) (119,737,962)
Realized gain (loss) on short-term investments 0 0 (1,172) 0
Dividend income 45,186 31,521 98,793 76,239
Interest income [1] 1,073,563 473,173 2,480,379 1,172,377
ETF transaction fees 48,000 30,000 192,000 76,000
Total income (loss) (10,667,801) (18,658,356) (147,656,035) 20,989,412
Expenses        
General Partner management fees (Note 3) 697,857 823,113 2,098,179 2,368,781
Professional fees 188,839 46,786 911,447 164,792
Brokerage commissions 403,584 440,975 1,204,240 1,526,497
Directors' fees and insurance 15,964 15,881 45,571 78,027
License fees 17,446 20,577 52,454 59,219
Registration fees 41,637 101,751 163,361 303,041
Total expenses 1,365,327 1,449,083 4,475,252 4,500,357
Net income (loss) $ (12,033,128) $ (20,107,439) $ (152,131,287) $ 16,489,055
Net income (loss) per limited partnership share $ (0.24) $ (0.32) $ (2.75) $ (0.36)
Net income (loss) per weighted average limited partnership share $ (0.17) $ (0.31) $ (2.32) $ 0.23
Weighted average limited partnership shares outstanding 70,036,041 65,875,172 65,584,425 70,525,965
[1] Interest income does not exceed paid in kind of 5%.